Hot-air heating apparatus



HOT AIR HEATING APPARATUS Filed April 9, 1923 2 Sheets-Sheet l i@ Y n l \FL 11"@ d a I ff Am j .f5/^ vfv f *EY 79M@ Mai/(M,

TTY S Aug. 31,1926. 3598,29

J. C. MILES HOT AIR HEATING APPARATUS Filed April 9, 1923 2 Sheets-Sheet 2 JIVENTOR. MW f/fff "HYIMQ Patented Aug. 31, 1926.

"PATENT o F-FlcE. i

JAMES C. MILES, 0F BLOOMINGTON, ILLINOIS.

HOT-AIR HEATING APPARATUS.

Application mea April 9, 1923. serial No. 630,740.

This invention relates to apparatus used in hot air heating systems and more particularly refers to an apparatus used in a system such as is shown and described in Patent No. 1,508,813 issued to me September 16, 1924.

Briefly, the apparatus illustrate-d in Patent No. 1,508,813 embodies a fan and la damper associated therewith whichiare ar-4 ranged to be positioned adjacent the inlet tothe heating chamber of a furnace. The damper is arranged to be open when the fan is stopped, and to be closed by the action of air pressure within the chamber` when the fan is in operation.

One of the objects of this invention is the provision of means for insuring opening of the damper when the fan is shut off. Another object is the provision of means whereby the damper is closed when the fan is set inA operation so as to prevent the passage of ir throughthe passageway across l which the damper extends.

The means for accomplishing the above objects will be hereinafter fully described in connection with the accompanying drawings and the essential 4features will be sum marized in the claims.

In the drawings, Fig. l is a side elevationl of a furnace showing the conduit leading thereto and illustrating my invention within the conduit adjacent the heating chamber of the furnace; Fig. 2 is a rear elevation of a unit embodying my invention; Figs. 3 and 4 are sections taken on the correspondingly numbered lines respectively in Fig. 2; Fig. 5 is a modified form of damper showing jthe application of my invention when the normal inlet to the furnace' is separate from the inlet controlled by the fan; while Figs. 6 and 7 are horizontal and vertlcal sections respectively lthrough the damper illustrated in Fig. 5..

In Eig. 1, I have shown the heating chamber of a hot air furnace'at 10, housing 11, and an inlet conduit 12. Disposed across the inlet opening and adjacent the casing| 11, I have illustrated a frame indicated generally at 13 which is provided passage 14 and with preferably two side passageways 15 and 16 respectively. jacent the central passage, I have shown a fan 17 which is operated by a motor indicated generally at 18. Disposed adjacent the` openings 15 and 1,6, I have shown dampers 19 and 20 respectively which with an inlet` dampers are so mounted that they are automatically moved to open position when the fan is stopped,vand pneumatically moved to closed position whenthe fan is set in operation. Thus I provide suiicient area for the admission of air when the fan is stopped, to prevent overheating or burning out of the furnace. f-

To effect an automatic operation of the dampers consequent upon starting and stopping of the fan, the axes of the shafts 21 and 22 on which the respective dampers are supported incline toward l'the furnace 1' as'. shown in Fig. 3. Moreover, each shaft extends lengthwise of the damper and is positioned to one side of a line passing through the midportion thereof. Consequently, each, damper has more weight on one side of the axis than on the opposite side, wherefore. the inclination of the shaft causes the heavier side of the damper to incline inwardly as shown by the broken lines 19a and 20a rel the chamber is greater than lthat in the air conduit 12, then since the area on the por- 4tion ofv each damper which extends toward the furnace isgreater than that fextending' away from the furnace. the dampers are pneumatically closed and are maintained 1n closed position so long as the fan is in operation` l With the apparatus heretofore described, l. the fan and dampers are arranged in a unitary structure which may 'be placed adjacent the inlet conduit of the hot a1r furnace. For installations wherein the usual inlet to the furnace is not satisfactory for permitting the use of the combined fan 'and damper unit, I may obtain the same, desired result by utilizing one inlet for the fan and another for the damperras illustratedparticularly in Fig. 5.

In this ligure, the heating chamber caslng 30 is provided with a normal air conduit 31 and a fan inlet conduit 32. These conduits may receive air from different parts of the building in which the furnace 1s placed. Within the conduit 31, I have shown a frame 33 in which a shaft 34 carrying a4 damper 35 is supported. This shaft as heretofore described is placed to one side of the midortion of the damper and is so supporte within the frame that the top thereof inplines toward the furnace. Normaly then, that is, 1n the gravity system,

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meeneethe amper is inclineci toward the furnace closeol hy the pressure acting on the larger area, as heretofore explained,

lin view of the foregoing description, it Will he seen that my invention provides a damper which is automatically openeol when the air impelling means is shut ofi, hut which is pneumatically closed when the air iinpelling means is set in operation. This is particularly advantageous in that automatic opening of the damper is eiecteci as soon as the motor which operates the fan is stopped, Wherefore sufficient air is acimitteii into the furnace to prevent overheating under the gravity system.

ll claingl in combination, a heating chamher having an air inlet, a Jfan for forcing air through the inlet, a damper mounted on an uprightinclined pivot adjacent the inlet, said pivot being so positioned relatively-to the damper that the normal action o3? gravity tends to open the damper when the fan is stopped, and permits closing ot the damper-when the fan is in operation.

2, in combination, a heating chamber having an inlet, a fan for forcing air through the inlet, a clamper adaptecl for controlling the How of air inthe chamberI saicl damper heing supporter?L on an upright inclinati pivot on one side or the miolportion thereof whereby the action of gravity' normaily tends to open the damper when the ian is stopped, butpermits pneumatic closing of the damper Whenthe/an is in operation.

3. lin a heating apparatus, the combination with a heating. chamber having an air inlet, oi a frame having tvvo openings therein anni positioned across the inlet, a fan occupying one of the openings, a damper occupying the other of said openings, sani damper being pivotally mounted on the frame in such manner that the top of the pivotal connection extends toward the chamber Wherefore the action of, gravityY tends to open the damper when the fan is stopped, and permits closing oi: the damper when the :ian is in operation.

4;. lin a heating apparatus, the combina tion .with heating chamber having an air inlet, oit a trame positioneoi across the inlet and having means ion supporting a shaft in 'upright position, one enti of said. shan being nearer the chamber than the opposite` end thereof, ian mounted. the trame on one side oi che shaft, and a damper carrie@ hy the shaft in such manner that the action o gravit nerr ally urges the cli-amper to open posit on -ile the ian is stopped, and permits ciosii fr ci the damper hy pneumatic pressure operation.'

o. ln a heefd fr ajrfrctus, the combina. heat 1g chan Ur having an air' inlet, of 'me positioned across the inlet, sais; iframe i airing openings therein, a ian positioned the central open ing, ampere pivotally mounted in upright gosition the eno openings, the pivotal connection 'oreach damper being inclineci at the top toward the chamber and also being on the outer sicleso-f the micportion of the damper openings, whereby the action of gravity normally tends to hol the flampers open when the 'ian is stopped, and to close the dempers when the fan is in operation.

6. In combination, heating chamber having an inlet, a fan for forcing air through the inlet, a damper aapteci for controlling the iiovv oi air in the chamber, said damper heing supportedcn an upright inclineol pivot on one side of the center oi? gravity thereorn so that the action of gravity normally tends to open the aia-inner when the fan is stoppe, hut permits pneumatic closing of the damper When the fan is in operation.

in testimony whereof, l; hereunto ax my signature., l

ian is in 

